This is a power analysis on the CPUE sampling program for the Quirk Creek watershed. A summary of the number of locations sampled by year is found in Table 1.
| Year | Locations | BKTR | BLBK | BLTR | CTTR |
|---|---|---|---|---|---|
| 1987 | 1 | 61 | 0 | 18 | 117 |
| 1988 | 2 | 0 | 0 | 0 | 7 |
| 2000 | 1 | 29 | 4 | 1 | 3 |
| 2006 | 3 | 1046 | 103 | 75 | 418 |
| 2007 | 2 | 624 | 23 | 81 | 371 |
| 2008 | 2 | 375 | 2 | 31 | 335 |
| 2009 | 2 | 94 | 0 | 2 | 161 |
| 2010 | 4 | 228 | 0 | 4 | 157 |
| 2011 | 2 | 219 | 2 | 5 | 220 |
| 2012 | 2 | 125 | 0 | 17 | 107 |
| 2013 | 2 | 110 | 4 | 12 | 76 |
A preliminary plot of the CPUE over time for each of the species is found in Figure 1.
The variance components were estimated after fitting a linear mixed model to the CPUE on the logarithmic scale. A summary of the estimated variance components is found in Table 2.
| Species | Sampling SD | Process SD |
|---|---|---|
| BKTR | 0.2 | 0.36 |
| BLBK | 1.36 | 0.88 |
| BLTR | 0.91 | 0.71 |
| CTTR | 0.27 | 0.48 |
A power analysis was conducted to detect a 10%, 30%, 50%, 100%, 200%, 300% change over 5 years by varying the number of sites given the sampling and process error estimated above. Results are summarized in Figure 2 (one plot per species).
Add text here summarizing the bleak results